I have a 2 acre pond I have 3 double 9'' vertex diffusers. Last year I only ran 2 of the double diffusers, they are both in around 12 foot of water. 1 is a 50 foot run and the other 100 foot. I was running the diffusers with a Thomas 2660. I had 2 pumps, 1 for each double diffuser. I done a rebuild on the top end of one of the pumps. I went ahead and turned my aeration on a little early for trial and error. I was running 2 of the doubles off one pump. The pump seemed to be failing yesterday as it was running louder and didn't seem to be producing as many bubbles. So my question is has anyone ever built a manifold and hooked 2 pumps up to it? What I'm wanting to do is add the third double disc diffuser in 8 foot of water. So I would have 2 pumps going in and 3 outputs on my manifold. I would put a check valve coming off each pump to insure it wasn't trying to pump air into the other pump.